Determination and Application of Welge Equation for Reservoirs After Water Breakthrough

doi:10.7657/XJPG20220112

Abstract

Abstract:

This paper reviews the establishment and development process of the Welge equation, and derives the Welge equation for oil wells after water breakthrough according to the finding that the water cut at the outlet of an oil well drilled in homogeneous reservoirs is numerically equal to that of this oil well after water breakthrough. Using this equation, the mutual conversion between water drive curves and oil-water two-phase flow characteristics can be realized. Taking Iraj Ersaghi’s watercut variation law, Maximov-Tong Xianzhang’s water drive characteristic curve and Efros’s experimental results as examples, the formation process and applicable conditions of them are discussed, and the classical theories and methods of water flooding are further understood. The result provides a reference for evaluating water flooding reservoirs.

Key words: Welge equation, water flooding reservoir, flow characteristic, water cut, characteristic curve, water cut variation, applica-tion analysis

CLC Number:

TE341

GAO Wenjun, TIE Qi, ZHENG Wei, TANG Xin. Determination and Application of Welge Equation for Reservoirs After Water Breakthrough[J]. Xinjiang Petroleum Geology, 2022, 43(1): 79-84.

Figures/Tables 2

References 29

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